Multilayer Capacitor Electrode Spacing for Low Inductance
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Solution Overview
Problem
Existing multilayer capacitors used as decoupling capacitors in digital electronic equipment face challenges in reducing equivalent series inductance while preventing short circuits and allowing connection to multiple circuits, leading to increased mounting costs due to the need for multiple capacitors.
Innovation Solution
A multilayer capacitor design featuring a multilayer body with alternately laminated dielectric and internal electrode layers, where internal electrodes are connected to terminal electrodes on opposite sides, with a specific distance range between electrodes to cancel magnetic fields and prevent short circuits, enabling connection to multiple circuits while reducing equivalent series inductance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple multilayer capacitors are prepared for mounting to multiple circuits, then each circuit can be properly decoupled, but mounting cost increases
Solution Approach 1:
The patent implements universality by designing a single multilayer capacitor with multiple terminal electrodes that can be connected to multiple different circuits simultaneously. The capacitor body serves multiple functions: providing decoupling capacitance to one circuit while also providing decoupling capacitance to another circuit, eliminating the need for separate capacitors for each circuit and thereby reducing mounting costs.
Solution Approach 2:
The patent applies segmentation by dividing the terminal electrodes into different groups that can be independently connected to different circuits. The terminal electrodes are segmented such that first and second terminal electrodes can be connected to a first circuit while third and fourth terminal electrodes can be connected to a second circuit, allowing one capacitor to serve multiple circuit decoupling needs.
2Ease of manufacture
If a single multilayer capacitor is designed to connect to multiple circuits, then mounting cost is reduced, but short circuit risk increases due to complex electrode arrangement
Solution Approach 1:
The patent applies local quality by ensuring that adjacent internal electrodes within the same electrode layer are positioned at a sufficient distance (20-200 μm) from each other. This local spatial arrangement maintains electrical isolation and prevents short circuits in the regions where electrodes are closest together, while still allowing the overall capacitor structure to serve multiple circuits through its multiple terminal electrodes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively reduces equivalent series inductance, prevents short circuits, and allows the multilayer capacitor to be connected to multiple circuits, thereby reducing mounting costs and improving performance in digital electronic equipment.
Implementation Method 1
the polarities of adjacent terminal electrodes are opposite to each other to cancel magnetic fields generated, thereby reducing the equivalent series inductance
Data Source
AI summary
A multilayer capacitor has a multilayer body in which dielectric layers and internal electrode layers are alternately laminated, and terminal electrodes formed on each of two mutually opposed side faces of the multilayer body. Each internal electrode layer includes a plurality of internal electrodes arranged in an array direction along a direction perpendicular to a laminating direction of the multilayer body and parallel to the side faces. A plurality of internal electrodes included in one internal electrode layer are electrically connected to the terminal electrodes respectively. A distance between a plurality of internal electrodes included in one internal electrode layer is not less than 20 μm nor more than 200 μm.